Assembly for insertion in a blast furnace wall



-w. c. COHN 3,043,578

ASSEMBLY FOR INSERTION IN A BLAST FURNACE WALL July 10, 1962 Filed Sept.22, 1959 INVENTOR:

WERNER C. COHN ATTORNEY UnitedStates Patent This invention relates to anassembly for insertion in a blast furnace wall and more particularly totuyeres and monkeys. These members are normally made of copper and aressbjected to extremely severe operating conditions because of the hightemperature in the furnace, abrasions from the moving furnace burden,and splashes of molten pig iron from the burden falling into the furnacebosh. The cinder notch monkey may also fail if molten iron mixed withslag comes in contact with its outside surface, if the slag passingthrough the orifice or opening in the monkey contains molten iron whichcontacts the copper casting or if an oxygen lance is required to burnthrough a plugged notch. Because of these conditions the tuyeres andmonkeys have a relatively short life. An assembly suitable for thispurpose is shown in the co-pending application of Schultz entitledAssembly for Insertion in a Blast Furnace Wall, Serial No. 841,634,filed September 22, 1959. However, the means of holding certain of theparts together in that assembly has resulted in a plane of weaknessunder certain conditions. While the life of the tuyere and monkey of theSchultz application is greater than previous tuyeres and monkeys thisplane of weakness somewhat shortens its life.

It is therefore an object of my invention to provide a blast furnacetuyere or monkey which has a longer than normal life and which hasimproved means for holding the parts together.

This and other objects will be more apparent after referring to thefollowing specification and attached draw ings, in which:

FIGURE 1 is a sectional view of a monkey in position in a blast furnace;

FIGURE 2 is a view taken on the line IIII of FIG- URE 1;

FIGURE 3 is an enlarged sectional view of the monkey of FIGURE 1; and

FIGURE 4 is a view taken on the line IVIV of FIGURE 1.

Referring more particularly to the drawings, the reference numeral 2indicates the Wall at the bottom of a blast furnace. A cinder notchmonkey 4 constructed in accordance with my invention is supported by acinder notch monkey cooler 6, which in turn is supported by a cindernotch cooler 8. While my invention will be described in reference to acinder notch monkey the same construction is used in a tuyere. However,the shape of the longitudinal opening through the tuyere and the shapeof the tuyere nose may vary from that shown. The monkey or tuyere'4consists of a body member 10, a nose 12, a sleeve 14 and a ring 16. Thebody member and ring 16 are preferably made of copper or a copper alloy.The term copper as used in the claim is meant to include pure copper oran alloy which is predominantly copper, these materials being those mostcommonly used in tuyeres. The nose 12 and sleeve 14 are made of arefractory material which must resist fusing or softening at theoperating temperature which is about 3000" F., crumbling, cracking,spelling and mechanical abrasion. It should also resist chemicalreaction with molten blast furnace iron and slag and should have a lowcoefiicient of expansion and contraction. Graphite and other forms ofcarbon have proved suitable for this purpose. Refractory oxides such asalumina, chromite, dolomite, magnesite, silica and zirconia may also beused. High meltflee ing point metals or alloys thereof such as titanium,molybdenum, zirconium, tungsten and vanadium are also suitable. The bodymember 10 is provided with the usual water cooling chamber 18 havinginlet and outlet 20 and 22. A longitudinal opening 24 is provided in thebody member 10. The opening 24 has a minimum diameter at the furnace endand a maximum diameter at the outer end. The body member '10 has areduced diameter portion 26 at its furnace end which provides a shoulder28. The nose =12 fits over the reduced diameter portion 26 and bearsagainst the shoulder 28. The furnace end of the nose 12 extends inwardlyto the opening 24. The body member 10 has a circumferential groove 30 onits reduced diameter portion 26. The nose 12 has a circumferentialgroove 32 matching the groove 30 and a generally tangential opening 34extending from the groove 32 to the outer surface of the nose.

In assembly, the sleeve 14 is inserted into the opening 24 and the nose12 is placed over the reduced diameter portion 26 with its end abuttingthe shoulder 28. A wire 36 is threaded through the opening 34 intothegrooves 30 and 32 so as to lock the nose 12 to the body member 10.Instead of using a formed wire, plastic material may be forced throughthe opening 34 into the grooves 30 and 32. The material used must be ofsuflicient strength and have sufficient heat resistance to hold theparts together at the high temperatures encountered. The ring 16 is thenpositioned in the opening 24 at the end remote from the furnace. may bedone by welding, but is preferably done by providing matching threads 38and 40 on the body member 10 and ring 16. In case of breakage of thenose 12 or sleeve 14 the monkey or tuyere can be-removed and the partreplaced.

While one embodiment of my invention has been shown y and described, itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claim.

I claim:

An assembly for insertion in a blast furnace wall comprising a copperbody member having a longitudinal opening therethrough and a watercooling chamber surrounding said opening, said opening having a maximumdiameter at its outer end and a smaller diameter at its furnace end, areduced diameter portion on the furnace end of said body member, apreformed refractory nose fitting over said reduced diameter portion andextending beyond the furnace end of said body member, a preformedrefractory sleeve fitting snugly within said longitudinal opening andextending into said nose, said body member having a circumferentialgroove on said reduced diameter portion, said nose having acircumferential groove matching said groove on said reduced diameterportion and a generally tangential opening fromits groove to its outersurface, a wire in said grooves separate from said-copper body memberand said refractory nose, and a copper bearing ring inserted withinsaidlongitudinal opening at its outer end and bearing against the end ofsaid sleeve, and means fastening said ring to said body member.

References Cited in the file of this patent UNITED STATES PATENTS176,913 Witherbee May 2, 1876 318,604 Devereux May 26, 1885 1,662,850Ebner Mar. 20, 1928 1,729,447 McKee Sept. 24, 1929 1,759,114 HolzworthMay 20, 1930 2,500,089 Neely Mar. 7, 1950 FOREIGN PATENTS 3,663 GreatBritain 1867 3,449 Great Britain 1877 277,400 Germany Aug. 11, 1914

